Drill.



PATENTED OOT.11, 1904. A. E. UTSLER.

DRILL. APPLICATION FILED SEPT. 4, 1903.

N0 MODEL.

77 Wis/Z63 a I g'cgfor.

v Jllfgrggys Patented October 11, 1904.

PATENT OFFICE.

ADAM E. UTSLER, OF DALTON, OHIO.

DRILL.

SPECIFICATION forming part of Letters Patent No. 771,849, dated October 11, 1904.

Application filed geptember 4:, 1903. Serial No. 172,000. (No niodel.)

To all whom it may concern.-

Be it known that I, ADAM E. UTSLER, a citi- Zen of the United States, residing at Dalton, in the county of Wayne and State of Ohio,

' have invented a new and useful Drill, of which to lessen friction during the cuttingoperation.

With these and other objects in view, as will more fully hereinafter appear, the invention consists in the novel construction and arrangement of parts hereinafter described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size, and minor details of the structure may be made without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings, Figure l is a perspective viewof a drill-bit constructed in accordance with the invention. Fig. 2 is a similar view of the adjacent end portions of two sections of the drillbit, the parts being slightly exaggerated in order to more clearly illustrate the construction. Fig. 3 is a detail sectional view of the end of the bit on the line 3 3 of Fig. 1.

Similar numerals of reference are employed to indicate corresponding parts throughout the several figures of the drawings.

In drills of this class, and especially those used for boring coal, the sharpened point of the drill is generally in the form of a blade extending in a continuous line diametrically of the drill, and when the drill comes in contact with a hard substance, as often happens in coal-mining, there is a tendency for the drill to work off to one side or the other and form a crooked opening,resulting in the breaking or bending of the drill. In order to overcome this difficulty and at the same time reduce the friction incident to the working of the cutting-point on the material, I form a cutting-point in the manner shown in Figs. 1 and 2. The edge is provided with a plurality of recesses 23, which materially reduce the length of the cutter in direct contact with the coal or other material being drilled.

In order to provide for the lengtheningof the drill when it is desired to bore very deep holes, the body portion of the drill is made in sections of the character best shown in Figs. 1 and 2. Each section 2& is provided at one end with a recess 25, provided at its opposite end with a tongue 26, adapted to fit in said recess, to thereby assist in transmitting the turning movement from one section to the other. The end which carries the tongue 26 is further provided with a pair of recesses 27, adapted to receive tongues 28, carried by the opposite end, and the several tongues and recesses when interlocked will form a practically continuous drill.

At the end of each section is a spring or catch 29, which when the sections are interlocked engages a recess 30 and serves to hold the sections together, so that after the drilling operation is completed the several sections may be withdrawn from the opening.

Having thus described the invention, what is claimed is 1. A twist-drill formed of a plurality of sections, the meeting ends of the sections being each provided with interengaging tongues and recesses, and a spring-catch disposed in the recess in one section and adapted to engage the recess in the opposite section, the spring when in engaging position having its outer face flush with and following the contour of the outer surface of the drill.

2. In a drill, a body portion formed in sections, each section being twisted to follow the twist of the working portion of the drill, the

ends of said sections being provided with inmy own Ihave hereto afiixed my signature in terfitting I projections and recesses, and a the presence of two Witnesses. spring-catch carried by one end of each sec- J tion for engagement With a locking-recess ADAM UTSLER 5 formed in the adjacent end of an adjacent sec- Witnesses:

tion. D. L. EDWARDS, In testimony that lclaim the foregoing .as W. H. SCOTT. 

